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Plane-parallel, 1-component models to obtain averaged properties of the atmosphere

Multiple components (e.g. to take care of scattered light, or unresolved features on the Sun). Allows for arbitrary number of magnetic or field-free components (turns out to be important, e.g. in flare observations, where we have seen 4-5 components).

Flux-tubes in total pressure equilibrium with surroundings, at arbitrary inclination

in field-free (or weak-field surroundings)

embedded in strong fields (e.g. sunspot penumbra, or umbral dots)

includes the presence of multiple flux tubes along a ray when computing away from disk centre

efficient computation of lines across jumps in atmospheric quantities

Integration over solar or stellar disk, including solar/stellar rotation